Sketch-based user interface is an important research topic in computer graphics to improve automatic processes with human power, such as shape retrieval [1]}, motion retrieval [2]}, image generation [3]}, [4]} and task guidance [5]}. For image-based shape editing, 3-sweep introduced an interactive technique based on extracting simple 3D shapes from a single image [6]}. Similarly, Gemketch can extend 3-sweep to extract 3D models of generalized rectangles and cylinders from single or multiple viewpoints [7]}. However, these approaches usually require strong assumptions or expertise on natural images. In this work, we use point cloud data as drawing background and allow users to sketch interactively in an iterative routine until satisfactory modeling is achieved.
